Slow Adaptation of Modulation and Coding for Packet Transmission

1. A method comprising: transmitting packets to a receiver using an MCS (modulation and coding scheme); receiving NACKs (negative acknowledgement) in respect of packets transmitted to the receiver; determining an updated MCS (modulation and encoding scheme) used to transmit subsequent packets to the receiver as a function of the received NACKs, wherein adapting an MCS (modulation and encoding scheme) used to transmit the sequence of packets as a function of the received negative acknowledgements comprises: counting a number of NACKs received over a time period, wherein updating an MCS (modulation and encoding scheme) used to transmit the sequence of packets as a function of the received negative acknowledgements further comprises: moving to a less aggressive MCS if the number of NACKs received over the time period exceeds a first threshold; moving to a more aggressive MCS if the number of NACKs received over the time period is less than a second threshold.

2. A method comprising: transmitting packets to a receiver using an MCS (modulation and coding scheme); receiving NACKs (negative acknowledgement) in respect of packets transmitted to the receiver; determining an updated MCS (modulation and encoding scheme) used to transmit subsequent packets to the receiver as a function of the received NACKs, wherein adapting an MCS (modulation and encoding scheme) used to transmit the sequence of packets as a function of the received negative acknowledgements comprises: counting a number of NACKs received over a time period, wherein the time period is at least 400 ms or comprises a sliding window.

3. A method comprising: a receiver receiving packets sent to the receiver over a wireless channel; the receiver making a channel quality measurement in respect of the wireless channel; the receiver making an MCS adaptation decision based on the channel quality measurement; the receiver feeding back a first signal to indicate that a more aggressive MCS should be used when the channel quality measurement is above a first threshold; and the receiver feeding back a second signal to indicate that a less aggressive MCS should be used when the channel quality measurement is below a second threshold, wherein the receiver feeding back the MCS adaptation decision is performed at least every 400 ms.